POWER FACTOR CONTROL SYSTEM FOR PLANT POWER SUPPLY EMPLOYING INVERTER DRIVER

摘要

PROBLEM TO BE SOLVED: To control the power factor of a power supply for the entire plant optimally by operating the extra reactive current supply capacity of the converter in each inverter drive and supplying a reactive current for power factor compensation up to the maximum rating of the converter. SOLUTION: A reactive power detector 10 detects a reactive power Q based on the signals from a power supply voltage detector 11 and a power supply current detector 12. An entire power factor control section 9 operates a reactive current command IQ* for optimizing the power factor the entire plant based on the detected values and commands inverter drives 8-1 to 8-N based on the results. Consequently, the power factor of power supply for the entire plant can be controlled optimally using the reactive current control function of a PWM converter in a group of inverter drive having highest power ratio and utilizing the extra reactive current supply function to the maximum.